Why does menstruation cause bleeding

Patient's question:

I remember I got my period when I was 11 years old. Back then, I knew nothing about it. I just saw that I was bleeding a lot and was scared, constantly screaming. Later, my mom explained to me for a long time that it was my period, but I still didn’t understand why girls would have this. Because I was young back then, I didn’t feel comfortable asking too many questions. Now that I’m in college, I want to understand it better.

Doctor's answer:

Hello, menstruation is a cyclic uterine bleeding. If the egg released by a woman is not fertilized, around 14 days after ovulation, the corpus luteum atrophies and stops secreting estrogen and progesterone. At this time, the blood vessels in the endometrium contract, the endometrium becomes necrotic and falls off, causing bleeding, which forms menstruation. The duration of bleeding is generally 2-7 days, and the total amount of blood loss during each menstrual period does not exceed 100 milliliters.

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